If You Reuse Passwords, the “3400_141225” Stealer Log Should Worry You

The "3400_141225" Stealer Log: 6,876 Credentials Uploaded to Telegram

HEROIC analysts identified a stealer log file named "3400_141225" posted to a Telegram channel on December 14, 2025. The file contains 6,876 records, each including an email address, a plaintext password, and a URL. This data comes from a stealer log rather than a single company breach, meaning it was harvested by malware installed on infected devices, so the records likely tie together people and sites that have no other relationship beyond the malware that stole their data.

Why This Is Dangerous

If you reuse the same password across multiple accounts, this kind of leak matters even if you have never heard of the specific site listed next to your credentials. Each record in this file pairs a working password directly with the URL it unlocks, so an attacker does not need to guess or crack anything, they can simply try the listed combination immediately. If that password also protects your email, banking, or work accounts, the risk extends well beyond the one URL named in the log.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs

Why This Matters

Attackers who obtain a stealer log like this one do not need to run large scale credential stuffing campaigns, since the correct password for each listed site is already provided. They can move straight to logging in and taking over the account. If any of the passwords in this file match ones you use elsewhere, those other accounts, potentially including email and financial services, are also exposed to account takeover, fraud, and identity theft.

How Stealer Logs Work

A stealer log is produced by infostealer malware, malicious software that infects a device, commonly through a fake download, pirated software, or a phishing attachment, and then quietly scans the browser and other apps for saved logins. Everything the malware finds gets bundled into a single file and delivered back to whoever controls it, who then shares or sells that file on Telegram channels like the one where this dataset appeared. Because the malware simply captures whatever was saved on the device at the time of infection, a log like this one can span many unrelated sites and services rather than coming from one breached organization.

Check If You Are Affected

If you want to know whether your email address or passwords appear in this or other stealer logs, HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including data pulled from stealer malware. Checking takes seconds and can tell you exactly which passwords to change first.